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The woman is seeking monetary compensation for "emotional pain, anguish and severe distress".

A month after the alleged incident the woman reported the matter to police but, after an investigation, the Santa Clara County district attorney's office told her "there was not enough evidence to prove the crime of rape beyond a reasonable doubt".

Hayne's NRL club, Parramatta, said they were unaware of the allegations until Wednesday.

"As with any legal matter it is important we follow due process and ensure we review all relevant information available, including giving Jarryd the opportunity to respond," the club said in a statement.

The NRL said the organisation's integrity unit would monitor Hayne's case.

"We note the police in the United States did not proceed with any criminal proceedings but we will review the information available and continue to monitor the civil case," a spokesman said.